3 replies so far

That sure is a worn plane sole. Luckily repair is easy: Flatten sole thorougly, rinse with pure alcohol (your sole looks like rosewood that does not glue well if not cleaned) and glue on a new sole. Would guess that it need it to be at least 15mm thick. The classic timbers are beech, hornbeam – or if super fancy – lignum vitae. Make sure to make the gap between iron and the mouth are super narrow.